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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7bdb0f10d454ad56cbd6a1739340d97c3e72bb6b1dc2155aaf0fb2ff4fcbfb' 
  AND token = 'QX0b+h/mea0FuEVp7YnXAPOGQD8hmFP4tmwZtYDjF3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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