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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a468bf82f8a145c108681d36ed747fddd8d0212f9b1e5b5dc07592351ef163d' 
  AND token = 'v3jLeTAcSpWxPdDBMSRey3F33JZ85cEzZqMQ192znJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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