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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c5f2967888ea288fae3ef0cb1b913a67d95454de1a2c072833b9e6f8834cf6' 
  AND token = 'rPXSFxBqsdhJPizkzTFEd+lMma59tNqIaKmWtubiNJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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