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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c9f9df226a3703ea41dde44f7059af1bf283d78e64183f55fbaa2cecda91b4' 
  AND token = '2zevbJzSTMfVAAg8HM6vIcnMWV5sA4x9+A22t/fVvFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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