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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3585a28294a5df752d8dcfc9988ccd5e263fb21c9745e53bf57742778b73b460' 
  AND token = 'i/TYdzZmm//tLsQ9QFTv1F1wS/NB5vHN3bIsuc1Bi94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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