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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba142e4b2981ca3f133310d46352d33e5b06cb21311acd5141d6b710331c5fec' 
  AND token = '4LwqDVRr00Ms98o3z88KqbUNM0PohhWa1IshvLgVd6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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