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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a2a77778968343d0e5aa4aeca66d1b98864e5e98c7cc80fd4822ce614bef5b' 
  AND token = '6eYxZUqm6Q9keYpp7T9B1vaGvL2nCx01bxbWf+KCoM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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