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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76b79def43dfcfdb01544b85db10fb94eddb1ee200c17026606ad7e885dfc83' 
  AND token = 'urXj10WP3ixAJjXpp1l245tHTJe0bt+p9woLgPimloQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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