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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02182be02dcd941b0a0db0387bda02624629c4537d4fca3bcb2e4e53159fa69f' 
  AND token = 'HX/nyhYIvF3PzVZ17uXS7dQ75Cf2WL41YlSU0qHO/7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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