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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd85bf61eb6eb2cb75b1323bb9a0cf69a23c94b9709ebb464e4147e869be02e0' 
  AND token = 'S5unTD+wudFqlJwzfE2Ha++cFyn+5nOfzP2YnPaZpkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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