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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9cac23e7a3e076550c262f619e8ff2aeabdc9044a92bc9df83aba4797c65f45' 
  AND token = 'oWBV3YvqZVD2ZYZ7j8tId0EYIa7Eq7avEDUdciLT1Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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