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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78768abea87bea7ca04716a7667b04e9fe612e134742a837bc326d4881f67b65' 
  AND token = 'B1Dt9Mma02ob6d1jrZWVBT2S5Z4YJ0+BQXDHjB3sP6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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