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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89ff8eb432c7339a004ad6cdf080e92f5fbc68ae97480880580410642bffbb1' 
  AND token = 'biA1/QO2Z5/8iOvQ5GhiSLWQGUcty9cydqgfx/itwjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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