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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9096c93f6a2bd105db55dc290fd60bd5fc05dc940df24bef46820f5d518448b1' 
  AND token = 'XBkQbTmij+YBj/XpnGuIEL2lC/fZpxdFLBCGZcbVcYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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