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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e258b37cd8de3aaba51db114b24252cab6e99c8a9d3acb7e0b2a460159e848b0' 
  AND token = 'YfoYkQMR5TzfAnGz1ArjLJX+eu8K2DdIsjJR1mSJxZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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