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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce3df1be57e069209151282d918864093c2fc54a90d60cfbb56e7231c077183' 
  AND token = '6TqfVVPfLCtw300Q36DRlYr2oBBCHWP/FMH+VWQlT34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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