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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3d8b26cc6744bc1f8444f8e5b954e2f82bfbdb22eccccc4f9bc32516eb8aa3' 
  AND token = 'dJGPw4s7e9WmwK5539SqrJL3AgFJtDeiSYtOeJAS1vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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