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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a1f005fa14b2b4fc76b11a7611cdc1fbb0eb5079931339cc587cbe60923934' 
  AND token = '0Dz2xhGnbHA/NvYhw0Wh33UKg2LQDinf91AKg0sCeQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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