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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f24c7fdad6aba19314e60ba744d3bc5292938e3bdd3d50343f067c72be49b8' 
  AND token = 'dHuclBLIkHy1EwylaSg13don+NKK0ofafk/Xz3HvRDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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