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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '186a688906de6e51802c637b16063d5eb045d8e925963db1dda9d55988f1b6bc' 
  AND token = 'IqJsXMRQwMM+/wi547y1zGNFn6sf4BY9alYBjB8X7/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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