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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804ee2e92785f3abc7384a2a5879a3cf06720abf709a9f4a25c71d1fae576093' 
  AND token = '+dEqWkymHuESrhlGoOJDGxM2JFvm4GMS+PYbbxAu/Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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