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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02fdb78c398cadd7f708508aca92c1a02da9e789f4c779ef35106c79f566608d' 
  AND token = 'iEfYUIDZcYjtacFgYxfHPCk4BJv2CBWqAuWRf0gtbiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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