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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5825a61200a2c8d5491fb83c6fd9bb12f836f542ba984e79709856ee6855dbcc' 
  AND token = '/hyXjHUq10Lu16ZnJ2W4UROx0hb+OLQe6jliNWMn0lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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