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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8feeefbf75efc0509dc7fb0f889ce0bb74ae32a19ecd2a342f7ba8f41a2a9364' 
  AND token = 'veBpr9NdCx9FR8R8U+mRET/0htyuZY2DzJ54EHZxclc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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