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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b670d9abc6d6fac4502e3e75360d517c8edfdf23d2db1fced3f02eb55989b89b' 
  AND token = 'xs0gEN9wr8DJeBN4KxWYXOoc4pqw6Zppwh7ah+i5BFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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