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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d0a21f8cb9938d8806f7dfbedc85417906a7deb23bcd3627de2b8de5768235' 
  AND token = 'kjc5rdkRRVTdruyvaqNu3i8GzPqe18MM7ayMjTD20N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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