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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d171dff2333bc2e65c5ce2cfbfb358335d0135265b815589213bde2c5054d7f' 
  AND token = 'DAfarh2vACaytSXtwY8Mw6YzAelNRm88lYkKeWp5geI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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