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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9537c64fc6142f6ca429c98f9181e6170aa3d8812433945e4c32ddf2120693' 
  AND token = 'JL92mlgbF7X3zWO0C3X0dHztoPJZDm4mupz/TcabDI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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