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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a65748049dd59c8455bfe778dc1f944e9c437817d9458bca0444a6b59bfae9' 
  AND token = 'BZ3sQdt/YokH2O93kWACEczDVUJ3Q6tY2ili3BYGliA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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