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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7446f5a1b54193efe6d04ae486d4d69f8a876ae78b2b7cbf8e5dcbee0876131b' 
  AND token = 'LSucmE/Oqzaq7n1OD0p2EXzbitu3Ys7/YZWL9mYjlKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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