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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffdf82d80af6a4dcd17a7a94ef40c5eec62f1c57947ebd4dc108a6fddd6be169' 
  AND token = 'KaawWvsvW/Xxqycj6X9kjjmEwlqEBP2xOTK4bPbk91w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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