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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be08174d31ad141d302ac36340c12bd06982184bf9758ce1f051eca2b87be2d2' 
  AND token = '/CvocyqCiqsq9w36rXVv/a7lZ6pB5AFfjV9EtZRWudE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}