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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815554cbe4ae5633e5ca2d2c66c281c53841f0f733e528c49d52818cdf6f04f2' 
  AND token = 'G3HDvCNWkbq/o8tA8Rt9TtFlAIQ1pWJlfIsaoG9RVDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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