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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6476ea9397c86c2151260d313fff965178d066d5877d889a506e55c53e9da0ff' 
  AND token = 'fZXCu0G0eliqS6tWZOm2D8k2XobGFFylvxRl3cU0pt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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