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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15f409cd06c2c04872773869fb190a93a7888903c57a06962fa89b67798569a8' 
  AND token = 'LtDT/xJQ4rI1ghefi+8qEu+bVTkzT8RB6ld9Cfmjp2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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