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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777e3fcc96ff6fa5d3df31d501aa0f2a3bc9c1d035f3eaebe8a7e10a38600ae7' 
  AND token = 'Ut8M3Zzvr5Jr8ghYA+p3Uaqh4ecYJGjO5cwqL1r5sn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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