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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f25c0db42a0b529c5616f40850946e756e912c8eaa9d850635d2df46fd5e3a8' 
  AND token = 'vEypV5UmL/PB9umVUXZNWxfW//U6mdz+9/9I6c9N1ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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