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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f8a08b287a2f4313ef5c66bcce1c66979c5cc9f5c106f10b7cd11707c8eb91' 
  AND token = 'nUOZIn9ykg93TRnPnwA86WYvOOhwPoaJXSHUcEEOX4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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