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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f439ab07dfbbff91158cc457ccfa70111f6cd9b67581d4909435bf1e4114686' 
  AND token = 'QosrERwmatknc1iPsk0bTqfaE/P+Pzha1pTol2y7YSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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