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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ee35e179abd036e728a91ef27f5626542a5049b59fbb1981246543e7b95c90' 
  AND token = '5iVVHW9oDJz4XVMJrGq4ypnWlOeq39LWCmIRbiSxi0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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