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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e75f2ba1d92ec3150fb48574de8c049ecbb165ef6077d9e3d6677cbbaf237c' 
  AND token = 'cQ1dCLUxO+no7qX3KI3mayhZ42joVm3lMD6YM5GXA1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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