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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '044004ffd4efe8f4afb0867926ab755af89fbd0d66092bf15a7b579a2c244a6f' 
  AND token = 'rmGSY0s7fGH9H01PUc3qQBJOERR86XCo0LekuuPiGLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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