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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08af8d9d4f5b0d96a97c98f3e62ce6c35fd878ead59acdf29aeec589458bec35' 
  AND token = 'f1D6dPjG4cuKr374lhQ7g9fuRsBWeY7IYkxqZy0zcWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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