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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59bd593463b2b63b5c487c3f674baa874bad0f9489fdf5962d3684c489fd3a24' 
  AND token = 'AORLTTkxT4wnbi2oS2BxCr5de6EdMuOJEBVVOu1/QOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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