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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a85fc02620394cb8c90bb409b1838301d31c6d45f919e2998ea9413422a1d8a5' 
  AND token = '6EUHkJHu9MyfOrtmivBVCuY2bPnheDG5jl8+ClvfvwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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