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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e4730d93512f3bedf4d6ce32c2c33bdd01b753927b9fe7a974171cf8ff63ce' 
  AND token = '1IVw+zKMRDvpnx3T9c5HQGEbmOB3K1pl36Rz3DDoY+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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