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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a22c3f676a43813c68bbc2d01a6e80e20d77a779b3664c0e94c515b1b0fb076' 
  AND token = 'lJUrd7Te/y3+rh7Bp16SSnJCHIH8be72GJW20I2I8jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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