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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5804242c0204bac5a4808faa99d9c30228de431c0f37d8707f0eaf8bf1ecdfda' 
  AND token = 'w6Gf8nib96Dav+jdJUOlHq3Imc01h2pqRDfhBxGU+mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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