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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af8792bb855743cf61bd3f019b86cae75ce277a5690fcf4c33c31fa13901c27' 
  AND token = 'eU9TMWG0oW+9QYRltiwxYX2DrdbssbEjBA9pKY3Iyk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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