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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a04f340b2d790ee2402e449ef7cad578cca1e91e1812134f59596cc28e0691' 
  AND token = 'fFr+FtkJtmh4FJOJzLntzv2fMtanSUbmf9elCm+2L/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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