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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aba4ba6bb1c135dec162fa9c2afc0a219aba5cd82b0ff5eced0a3f2aaf11d9e' 
  AND token = 'x6R+vWCNkxB5wW8jlMSOx6X09di6OS2JhVBunJaIjkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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