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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21d814d0afef8b24b575ba50d54dc2568b66c4c0454fb163bfa3c9132a6b62cd' 
  AND token = 'Z7eooIvCRdKTYP4dcnEyaDzUT6In8i+A/so61K9yBVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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