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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec93e8f9f3fdf8c219179707b69f7ed87a62df9497fd3307c8077b789ea4af4' 
  AND token = 'GD3jTmGXVgPV7ruF6fX4eiUw1EpwYZFGkVnPmGaFExg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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