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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb579b1451d4dc2c14c7c6f9ee36bb8aafb0a532847bcf73a58ed5613ea3fc3' 
  AND token = 'pRf8Ddia1XxtTbMxMGXoBrgMFEB+BAJzBmNCPcZ8bcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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