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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '071b1d99ee4bf5f9fc0219c8f9a419d0f40f7560bcd215900b13ad3044a4c499' 
  AND token = '7lurtFdCJmmReM7dRJsj9v0J8aiZXW7eH3suYOdNiqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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