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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d39463f018733b66f465a22b82412d636a8c62c99a1f3bd0c87b9bdc749d172' 
  AND token = 'uLFrmMwmEtBzzfF3AyuR0ceZf86DRVEDNk76AELV4ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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