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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa18c3d0fc0b0ce2ede4af4d10a4d4ad31c946198a3761ae6bb28a45b089f7be' 
  AND token = '+QBpWjIvbgLbR/4jPTmj2kb5PtGrgv3pEzNMNrPi1m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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