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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e36b2cf9ab1be330c5cac0fcfc1aa48e2a2f5b1938d50e18594de382e5693f4' 
  AND token = '70N7+Qy+oLvFe/fQLpjCoZi0Sz29fbJNHWMu3XwWFLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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