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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b75a046f50799ae83da4a1798c0822f08818206cc1ee522ddf65308d7669bd' 
  AND token = 'RJ7oBV0buBe2czXpbDJrT1TIEgeizZNTyQXa2hNFdX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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