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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6790a77d38b77d191f5f75fb6e001ea69d28ea4b678c48ffbb2b15e92f77766c' 
  AND token = '9bjhItR5LodSThdmXjdEAyB9NSTXsdAiMltfDn97iLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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