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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef67ba9e72f927ba5db0f57e15f7bc3ad9ce3a622557e1f030d731f5bfb065c' 
  AND token = 'XnRnuz3YABYkxsH3Cpdh9QN1hwE7RvCZ7Qn4s7o4X8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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