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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc62fbe4f0f315bf604e3f971010af5fe5be8aca8c9699463511fb0476e78ac5' 
  AND token = 'lMpLuKD6NuX9ZhnHohoI0gzlIov4iAYfSjZ3mchnV/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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