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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb06d13ca3813f3070955214ea510982ca95d52f73700da241344400f9d346b9' 
  AND token = 'vDaS5mb56sLmcU9Ulm+qqnJ2UN4sqmIiXaROWMZZ3PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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