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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2931bde9ba8a65f57c1f21b1811395854ff249c51fd04b8a633ab50a5d295016' 
  AND token = 'qTikwG6ENDXyC4kNWT60TK3D9oYlDss4flARGSe1Mgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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